@pnkfelix: I removed them both because they are little used and their presence doesn't really follow the #7887 standard naming scheme. Chaining almost always wants to move the results, but with #7887's preference for references, we'd have to have the short form, `.and_then` handle references, and add a long form `.and_then_move` handle moves. Since the latter will be used much more heavily than the former, it seems like a waste to use the short form on a little used method.

If we want this functionality back, would everyone be okay if I broke the #7887 naming standards for this case and added `.and_then_ref`?